The Affiliated High School of Peking University (北京大学附属中学), commonly known as BDFZ, is a public secondary school in Haidian District, Beijing, affiliated with Peking University. Founded in 1960 on the basis of Beijing No. 104 Secondary School, it is one of Beijing's demonstration high schools. In public discussion of elite secondary education in Beijing, it is often grouped among the leading schools of Haidian District, sometimes informally referred to as the "Haidian Six Tigers". The school includes junior and senior secondary divisions as well as an international division, Dalton Academy.